Properties of the Number 21372

Twenty-One Thousand Three Hundred Seventy-Two

Basics

Value: 21371 → 21372 → 21373

Parity: even

Prime: No

Previous Prime: 21347

Next Prime: 21377

Digit Sum: 15

Digital Root: 6

Palindrome: No

Factorization: 2 ² × 3 × 13 × 137

Divisors: 1, 2, 3, 4, 6, 12, 13, 26, 39, 52

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

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Representations

Binary: 101001101111100

Octal: 51574

Duodecimal: 10450

Hexadecimal: 537c

Square: 456762384

Square Root: 146.19165502859593

Classification

Fibonacci: No

Bell Number: No

Factorial Number: No

Regular Number: No

Perfect Number: No

Special

Kaprekar Constant: No

Munchausen Constant: No

Armstrong Number: No

Kaprekar Number: No

Catalan Number: No

Vampire Number: No

Taxicab Number: No

Super Prime: No

Friedman Number: No

Fermat Number: No

Cullen Number: No

OEIS Sequences

Visible factor numbers (VFNs): composite numbers k with the property that every prime factor of k can be found in the decimal expansion of k and every digit of k can be covered by a prime factor. A83359

Subsequence of sequence A083359 in which every prime factor can be found in the number at least as often as it is factor of the number. A83361

Conceited Numbers: Composite numbers that are a concatenation of their distinct prime factors with multiplicity in some order allowing overlap. A324257

T(n,k)=Number of (n+1)X(k+1) 0..2 arrays colored with the maximum plus the upper median plus the lower median of every 2X2 subblock. A236663

G.f. satisfies A(x) = (1 + x) * (1 + x/A(x)²). A366326

Numbers k such that 6·p(k)*p(k+1)*p(k+2)*p(k+3)*p(k+4)-1 and 6·p(k)*p(k+1)*p(k+2)*p(k+3)*p(k+4)+1 are twin primes with p(h) = h-th prime. A129310

Number of parts in all partitions of n in which no part occurs more than four times. A320607

Partial sums of A097893. A385641

Smallest number containing exactly n prime factors in its decimal representation. A131931

Row square-sums of triangle A096815. A212265